| The search for evidence of dark matter is closely connected to particle physics and cosmology of the early Universe. Annihilations of dark matter particles in our galaxy could give diffuse sources of excess antiparticles or gamma rays. We interpret recent cosmic positron, electron, antiproton, proton, and gamma ray data in terms of dark matter annihilations or decays. We find that the dark matter annihilations must be preferentially to muon-pairs or tau-pairs and that a TeV mass of the dark matter particle is preferred. We also find that helicity-suppressed two-body final states from dark matter annihilations leads to a generic signal of energetic gamma rays. Dark matter particles could be detected at colliders as massive missing particles that have been predicted by Beyond the Standard Model theories. For the neutral gauge boson dark matter candidate of the Little Higgs Theory, we consider the consequences of anomalies that can destabilize the dark matter candidate and lead to jets instead of missing energy as the collider signal. Dark energy can also be modeled in the particle physics perspective as scalar fields that govern the cosmic expansion in the inflationary era and the eventual dark energy dominated era. We analyze measurements of the cosmic microwave background, baryon acoustic oscillations, and Type-Ia supernovae to constrain a late-time dark energy scalar through the Friedman equation. We also show that cosmic microwave background and future hydrogen 21-cm emission line measurements can put stringent constraint on slow-roll inflation fields. |
